Overview
The ZF 4651.004.043 4 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the torque converter, clutch packs, and planetary gear sets into a single, ready-to-install package. As a core component of the WG 100 Series, it delivers reliable power transfer in wheel loaders, graders, and industrial vehicles. The SKU 4651.004.043 ensures you receive the exact OEM-specification assembly, eliminating guesswork during replacement. This unit sits directly between the engine flywheel and the driveline, managing all gear ratio changes through hydraulic modulation.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the internal clutch packs or seals degrade, the transmission hesitates before engaging forward or reverse, or it slips when the machine is under heavy load. This is a common long-tail search query for “ZF powershift slipping under load.”
- External oil leaks near the housing joints: Worn gaskets or a cracked TRANSMISSION HOUSING can cause fluid to weep from the bell housing or side covers. Look for puddles of ATF or hydraulic oil after the machine sits overnight.
- Erratic shifting or harsh engagement: A failing valve body or contaminated oil from a damaged SCREEN SHEET can cause abrupt, jarring shifts. This symptom often leads to searches like “ZF transmission harsh shift fix.”
- Overheating and burnt oil smell: Internal friction material wear generates excessive heat. If the O-RING seals fail, pressure loss accelerates clutch burn, producing a distinct acrid odor.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight (dry) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | Cast iron (GGG-40) |
| Input Torque Capacity | 500 Nm (continuous) |
| OEM Reference | ZF 4 WG 100(500) |
| Fluid Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This complete unit is specifically engineered for the ZF WG 100 Series transmissions, including the 4 WG 100 and 4 WG 100(500) variants. It is also compatible with select models in the WG 180 and WG 200 families when used with the correct adapter kit. For proper sealing, always inspect the HOUSING and the HOUSING cover for cracks. The assembly fits most ZF-equipped wheel loaders from Liebherr, Volvo, and Caterpillar models built between 1995 and 2015. Verify your transmission tag before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Rear cover for clutch pack access |
| 0634303928 | O-RING | Seals housing joint against leaks |
| 4651301024 | HOUSING | Front bell housing adapter |
| 4651203002 | SCREEN SHEET | Oil filter screen for pump intake |
| 4651303005 | SCREEN SHEET | Secondary fine mesh filter |
| 0636101032 | CAP SCREW | Fastener for housing mounting |
| 0630361028 | SEALING CAP | Plug for test ports |
| 4475280060 | SCREW PLUG | Drain plug for oil pan |
| 0634303312 | O-RING | Seal for screw plug |
